Add unquote method

lib/utils/common.js

@@ -24,6 +24,19 @@ class common extends utils {
     }
   }
 
+  /**
+   * Remove quotes and escape sequence from string
+   * @param {string} s
+   * @returns {string}
+   */
+  static unquote (s) {
+    return s.replace(/\\'/g, '\'')
+      .replace(/\\"/g, '"')
+      .replace(/\\0/g, '\0')
+      .replace(/\\\\/g, '\\')
+      .replace(/(^['|"])(.*)\1$/gm, '$2')
+  }
+
   /**
    * Unicode safe b64 encoding
    * https://developer.mozilla.org/en-US/docs/Web/API/WindowBase64/Base64_encoding_and_decoding#The_Unicode_Problem